// RFID Test Circuit //

#include <SPI.h>
#include <MFRC522.h>

#define SS_PIN 10
#define RST_PIN 8
MFRC522 myRFID(SS_PIN, RST_PIN);  // Create MFRC522 instance.

int pinLED = 2;
int pinLED2 = 3;

void setup() {
  Serial.begin(9600);  // Initiate a serial communication
  SPI.begin();         // Initiate  SPI bus
  myRFID.PCD_Init();   // Initiate MFRC522
  Serial.println("Please scan your RFID card...");
  Serial.println();
  pinMode(pinLED, OUTPUT);
  pinMode(pinLED2, OUTPUT);
}
void loop() {
  // Wait for RFID cards to be scanned
  if (!myRFID.PICC_IsNewCardPresent()) {

    return;
  }
  // an RFID card has been scanned but no UID
  if (!myRFID.PICC_ReadCardSerial()) {

    return;
  }
  //Show UID on serial monitor
  digitalWrite(pinLED, HIGH);
  Serial.print("USER ID tag :");
  String content = "";
  for (byte i = 0; i < myRFID.uid.size; i++) {
    Serial.print(myRFID.uid.uidByte[i] < 0x10 ? " 0" : " ");
    Serial.print(myRFID.uid.uidByte[i], HEX);
    content.concat(String(myRFID.uid.uidByte[i] < 0x10 ? " 0" : " "));
    content.concat(String(myRFID.uid.uidByte[i], HEX));
  }
  delay(500);
  digitalWrite(pinLED, LOW);
  Serial.println();
  // Serial.print("Message : ");
  content.toUpperCase();
  if (content.substring(1) == "32 AB CC 05")  //change here the UID of the card/cards that you want to give access
  {
    Serial.println("Access Granted!");
    digitalWrite(pinLED2, HIGH);
    Serial.println();
    delay(2000);
    digitalWrite(pinLED2, LOW);
  }

  else {
    Serial.println("Access Denied!");
    delay(2000);
  }
}